The ultra high frequency band of radiowaves in electromagnetic wave is used as in

Options

A. television waves
B. cellular phone communication
C. commercial FM radio
D. both (a) and (c)

Answer

To solve the question regarding the use of the ultra-high frequency (UHF) band of radio waves in electromagnetic waves, let's analyze the options provided step by step.

### Step 1: Understand the UHF Band
The ultra-high frequency band typically ranges from 300 MHz (megahertz) to 3 GHz (gigahertz). This range is significant for various types of communication technologies.

### Step 2: Evaluate the Options
1. **Television Waves**: Television broadcasting, particularly for digital TV, often utilizes the UHF band. Therefore, this option is valid.

2. **Cellular Phone Communication**: Cellular phones operate in the UHF range, especially in the frequency bands allocated for mobile communications, which can go up to several gigahertz. This option is also valid.

3. **Commercial FM Radio**: FM radio typically operates in the Very High Frequency (VHF) band, which ranges from 30 MHz to 300 MHz. This is lower than the UHF band, making this option invalid.

4. **Both A and C**: Since option C (Commercial FM Radio) is not valid, this combined option is also invalid.

### Step 3: Conclusion
Based on the evaluation:
- The UHF band of radio waves is primarily used in **television waves** and **cellular phone communication**.
- The correct answer is that the UHF band is used in **television waves and cellular phone communication**.

### Final Answer
The ultra-high frequency band of radio waves in electromagnetic waves is used in:
- **Television Waves**
- **Cellular Phone Communication**